Improvement in hoisting apparatus



nu: nomas Parmis co., wAsmNcmN, D. c

man tiling* anni v` @da VllVIL-'lilfillf D. ANDREWS, OF BROOKHAVEN, NEW YORK.

Letters man No. 110,331, cated December 2o, 1870.

IMPROVEMENT IN HOISTING APPARATUS'.

The Schedule referred to ln these Letters Patent and making part of the aame.`

To all whom 'it army/camera:

Beit known that I, WlLLm-M D. ANDREWS, of the town ,of brookhaven, in the 'county of Sulioll; and

State of New York, have invented a new and useful Improvement in Hoisting Apparatus, of which the' following is a full, clear, and exact description, referencebeing had to the accompanying drawing forming internallyl.geared4 fulcrnm-wheelLof the same diameter A-at-its-pitch-line,arraiued by the side of the former,

and with its center in the samey line, said fulcruxnwheel being fast to a hollow shaft, which passesv through the center of the drum at one end and forms a bearing for the drum to turn upon, and from thence passes through suitable boxes or bearings, in which it is supported. Connected with this fulcrum-wheel is a brake-wheel for holding the fulcrnm-wheel stationary, or forpermltting it to revolve, as may be required;

also, in some cases, connected with the fulcrum- -`wheel, 1s a second drum, for use as hereinafter described.

f The opposite end of the first-mentioned drum to that fthrough which the shaft of, the fulcrum-wheel passes has a hollow shaft, arranged to turn with it in asuitable box or bearing. The fulcrum-wheel has one or more teeth lessor more than themovable wheel.

The actuating-wheel of the apparatus is of less diameter, and has one or Amore teeth less than either the. movable or fulcrum-wheel, which teeth are external, and ot" a breadth equal to those on the movable and Yfnlcrum-wheel's combined, into which they mosh simnltaneously,.tooth for tooth, being carried around within them by acrank or eccentricupon the'driving-I shaft, said crank or eccentric serving as a bearing for the actuating-wheel torturn upon.

A second i'ulcrum-wheel may be placed at the other side of the movable wheel, the same being, together'.` with its shaft, bearings, friction-brake wheel, and drum, duplicate of the hereinbefore-mentioned similar combination, and itsvshaft forminga vbearing for the other end of the main drum to revolve upon.v

When a second fulcrnm-wheel is used, the breadth on the face of the actuating-Wheel or pinion is increasedto mesh into it simultaneously with the other.

Referring to the accompanying drawing-L-` A is the foundation-plate orplates, carrying standard-bearings 1,v 2, 3.`

, power.

`Gr is the main drum, to which the weight to be moved is attached bya rope, R..

The drum G has hollow'shafts, b b', upon either end, the shaft` b revolving in a bearing, 4, and the shaft b upon the hollow shaft d of "a fnlcrum-wheeh, E. VUpon the inner side' of the drum Gris att-achedl an internally-geared ymovable wheel F, having, as a given number, by wan of example, thirty-five teeth.

The fnlcrum-wheel E is also internally geared, and" of the same diameter at its pitch-.line as the movable wheel Fand has thirty-six teeth. This wheel Epis secured to the hollow shaft d, which passes' through and forms a bearing for the hollow shaft b' of the' drum G, thence through the bearings 2, 3. Upon this hollow. shaft d are screwed the friction-band .wheel H and a second drum, I, to which is attached the "rope'S,

B is the driving-shaft, having'an eccentric, D, upon `it,which carries the actuating-wheel or' pinion O,- on 'which is external gear, meshing into both movable vshaft b ofthe drum G, and hollow shaft d of the ful- Crum-wheel E, on which last-named shaftthe frictionbandavheeluH and drum I are secured, andwithin which the shaft B freely revolves without stress Aor strainupont, except what is required vto revolve the actuating-wheel or pinion G. y

Thebrake being applied to the wheel H to'hold the fulcrum-whe'el stationary, and the weight to be moved attached' to rope lt,motion` is communicated to the shaft B, which-causes the periphery of pinion O to v move around in contact with the inner periphery ot wheels E and F, making one circuit at eachrevolution of the shaft, the teeth on the pinion meshing v simultaneously into Athe teeth of both the wheels E and F. The wheel E having thirty-six teeth, 'and heilig stationary, and the wheel F thirty-five teeth,

vand free to revolve, at, every full circuit of the pinionV around the internal periphery of the fulcrum-wheel, the movable wheel is advanced to the extent of the diiference betweenit and the" fulcrum-wheel, or one toot-h. The number of teeth on the movable `wheelbeing thirty-five, it thus requires thirty-ve revolutions of the driving-shaft to communicate one revolution to the drum' G,.resulting`in a thirty-tive fold The difference in the number of teeth in the fnlcrum and movable whccls lnay be varied to obtain any `required difference' in power, and either one may have the greater or lesser number, the only difference by suchy transposition being that the movement will be in a contrary direction.

By my arrangement, whenthe po'wer is removed. from 4the driving-shaft, no back motion of the wheels can occur', but the-weight is heldl stationary 'willonever placed, the position 'ofjhgetllof the' pinion, in 'a l' l direct line with and'betweenthe teeth of the movable.

andfulcrum-wheels, operating as a' perfect pawl or stop solong as the fulcrnm-wheel is held stationary.

When it is which'rope R is connected and the fulcrum-wheel released, both themovable and fnlcrum-wheels bee-ome movable, and act as fulcrum-wheels each to the other, said drums moving in opposite directions with a ve- .locity 'equal' to one-half thatattained when one is *held stationary, and the drums being ofthe same.

size, the power is doubled.

By making-the vsecond drum of less diameter than the first, the power-will he further increased in proportion to one-half the 'difference in diameter of the two drums, or the double power may be reduced by`.

increasing the size oi' the second drum. l

When more than one drum is used, the weight can only be lowered by reversing the motion of 'the gearing. When heavy weights are to be raised, it is desirable to use-a second fnlcrnm-wheel upon the opposite vsideof the movable wheel, the same being a perfect fac similaof the one shown,.with similar shaft, -.frictienband wheel, drum, and bearings, andthe face of the pinions being widened suieiently to mesh into all the wheels simultaneously. When one fnlcrumwheel yonly is used, the pressure upon the two ends of the teeth in the actuating-pinion being in opposite directions, a twisting strain results around the center of the tooth as a fulcrurn, which is connteracted byv the hub in its bearing upon the crank-pin or eccentric, creating a certain aln'onntl of friction thereon. By the use o'f two fulerum-wheels this invisting strain upon the tooth. is obviated, .which is' desirable when very heavy-weights are to be raised. l The same results may beobtained by-reversing the style ofv wheels, substituting external gear for interdesired tolower' the weight without de-A taching the power or reversing vthe motion, it may be principle of action.

To increase the l and three drums are used, a rope isi/connected to each drum and 'attached to the weight to he raised,

only are used. Y

. To simplify and cheapen the machine, when one given power only is wanted, the drums attached to the fulcrum-wheels and the outer bearings are dispensed with, and if the facility for rapid lowering is not required, the brake-wheels are also dispensed with,

dent with the centers of the movable and fulcrumk"wl'ieeis, ,the pinion meshing intoA the movable and Fulcrum-wheels simultaneously, tooth for tooth.-

' ,2. 'The combination with the gearing, .as described, 'of a `frictionbrake, attached to the fulmine-wheel.v forthe purpose of holding it stationary when hoist ing, and' permitting .it to revolve, when. required, to

or stopping the mbving power. V

3. The twoeoncentrio drums,fmovinginiopposite directions, in combinaiionwith gearing, substantially as described, for the purpose ot' increasing the power of the'machiue, as'specified.

WM.` D. ANDREWS.

Witnesses n FRED. HAYNEs,

HENRY PALMER,

nal, and internal for external, retaining the same power when two fulcrum-wheels v withpreci'sely the saine result vas when two drums fand the fulcrnm-wheel shaft or shafts, if two are used,

described, of" movable and attached toa driving-shaft, whose center-is conciadmit of the weight being lowered without reversing 

